Samsung MZ-77Q4T0 4 TB 870 QVO SATA 6Gb/s 2.5 inch Client / Consumer Solid State Drive

General

Brand	Samsung
Model	870 QVO
Capacity	4 TB
Usage Class	Client / Consumer

Interface

Host Interface	SATA 6Gb/s
Total Interface Bandwidth	6 Gb/s

Physical Dimension

Form Factor	2.5

Flash & Endurance

NAND Flash	Samsung V-NAND 4bit QLC
Drive Writes Per Day	0.3
Total Bytes Written	1440 TBW

Performance

Sequential Read	560 MB/s
Sequential Write	530 MB/s
Random Read IOPS	98000
Random Write IOPS	88000
Average Latency	35 μs

Reliability

Mean Time Between Failures	1.5 Million Hours
Uncorrectable Bit Error Rate	1.0×10⁻¹⁷
Power Loss Protection	No

Part Number

MPN	MZ-76Q4T0

Engineer's Note

The Samsung 870 QVO 4TB (MZ-77Q4T0) is the stronger SATA upgrade over the previous MZ-76Q4T0, increasing sequential performance to 560/530 MB/s from 550/520 MB/s while pushing random performance up to 98,000/88,000 IOPS for snappier access under mixed desktop workloads. With 4TB of Samsung V-NAND 4bit QLC and a 1,440 TBW endurance rating, it offers a better balance of high-capacity consolidation, near-interface-limit SATA throughput, and predictable read-centric performance than the prior generation.

Endurance & Reliability

With an endurance rating of 1440 TBW, the MZ-77Q4T0 can sustain about 400 GB of writes per day for 10 years, which is comfortably above the write volume of most OS boot drives, office PCs, and general-purpose business systems. In practical terms, for typical read-heavy and mixed daily workloads, it provides ample endurance headroom and can serve reliably as a long-life system drive. Its UBER rating of 1.0E-15 means the drive is designed to maintain a very low rate of unrecoverable read errors, supporting dependable data access in normal enterprise and commercial use. This model does not include power-loss protection (PLP), so while it is well suited for standard systems and client or light business deployments, environments with frequent unexpected power interruptions or critical in-flight write protection requirements should pair it with stable power design such as a UPS.

Technical Specs & Insights

1. Its SATA architecture runs essentially at the practical limit of the platform, making it a cost-effective upgrade for legacy servers and storage appliances without needing PCIe infrastructure changes.
2. Strong small-block read performance helps VDI boot storms, metadata queries, and read-heavy databases stay responsive under concurrent enterprise access.
3. This endurance class is best aligned with read-centric business workloads such as content repositories, backup staging, and analytics cache layers rather than heavy write-ingest environments.
4. Samsung V-NAND QLC enables high capacity at a lower cost per terabyte, which is valuable for dense warm-data storage where maximizing usable space matters more than aggressive write endurance.
5. Its very low typical read latency reduces application wait time, improving perceived responsiveness in web services, virtual desktops, and index-driven search workloads.

Capacity Sweet

Lower capacity reference: 2 TB Higher capacity reference: 8 TB In this series, the 4 TB model sits at the practical sweet spot. Compared with the 2 TB version, it gives much better headroom for OS images, application stacks, hot data, and growth buffer, reducing the risk of early capacity pressure. Compared with the 8 TB option, it preserves nearly the same mainstream SATA performance profile while keeping acquisition cost and per-node spend under tighter control. This makes 4 TB especially well suited for mid-scale virtualization clusters, branch database nodes, or around 60 to 80 general-purpose VDI desktops.

FAQ